package com.qf.controlle;


import com.qf.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * 可以试着写一个OSS桶
 */
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 图片文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R upload(MultipartFile file) {

        //得到原始上传名字
        String name = file.getOriginalFilename();
        //截取后缀
        String sname = name.substring(name.lastIndexOf("."));

        //uuid得到新的前缀名字
        String fname = UUID.randomUUID().toString().replace("-", "") + sname;

        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()) {
            //目录不存在，需要创建
            dir.mkdirs();
        }

        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath + fname));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fname);
    }

    /**
     * 图片下载
     *
     * @return
     */
    @GetMapping("/download")
    public void  DownLad(String name, HttpServletResponse response) {
        try {
            //输入流
            FileInputStream inputStream = new FileInputStream(new File(basePath + name));
            //输出流,通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            inputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}